Statistics – Computation
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm22a0559s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM22A-0559
Statistics
Computation
2411 Electric Fields (2712), 2443 Midlatitude Ionosphere, 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling
Scientific paper
Results from a numerical study of localized, intense electromagnetic structures recently revealed from DMSP observations in the nightside sub-auroral zone are presented. It is shown that some of these structures can be interpreted as Alfv{é}n waves produced in a result of electromagnetic interaction between the equatorial magnetosphere and the nightside sub-auroral ionosphere. The main part of this interaction is the active ionospheric response (feedback) on a large-scale electric field generated in the equatorial magnetosphere and penetrating down to the ionospheric E-layer when the ionospheric Pedersen conductivity is low. In particular, computations show that when the Pedersen conductivity is less then 1 mho small-scale irregularities in the E-layer plasma density can generate Alfv{é}n waves with substantial amplitude. Initially, perpendicular electric and magnetic fields in those waves are in phase and corresponding Poynting vector is directed along the ambient magnetic field from the ionosphere. As time proceeds, the standing pattern of the resonant Alfv{é}n waves has been developing between the ionospheres and π /2 phase shift between wave Eperpendicular to and Bperpendicular to appears. In this time the Poynting vector can change several times direction along the ambient magnetic field within one structure. Both behaviors of Poynting vector were observed within intense electromagnetic structures registered by DMSP satellites in the sub-auroral zone. In this study the non-linear aspects of the ionosphere-magnetosphere coupling leading to the formation of small-scale intense electromagnetic structures are investigated depending on the parameters of the ionosphere and magnetospheric plasma along the entire sub-auroral flux tube. Computations show good quantitative agreement between numerical results and selected satellite and Millstone Hill radar observations.
Foster Christopher J.
Mishin Evgeni V.
Streltsov Anatoly V.
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